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Data Proposed For Exclusion From NAAQS Compliance Determinations

"Exceptional Events Documentation Packages"
Data impacted by an exceptional event may be excluded from use in determining compliance with the National Ambient Air Quality Standards (NAAQS) when they meet certain criteria defined in 40 CFR § 50.14 - "Treatment of air quality monitoring data influenced by exceptional events". Exceptional events are defined as events that occur and impact air quality that cannot be controlled by human intervention and that are not expected to reoccur, such as wildfires. To exclude data impacted by an exceptional event the agency must demonstrate to the Environmental Protection Agency that the event occurred, the event impacted the monitor, the value measured was not what would have been expected for that location and season (i.e., it was atypical), and that the NAAQS would not have been exceeded if that event had not occurred. The following fine particle exceptional events documentation packages have been prepared and submitted to EPA:

  • Site Prep Burn N102005-11 in South Carolina, Prescribed Burn, October 2005, affecting two exceedances in the Mecklenburn County Local Program Area
     
  • Shortoff Fire, Prescribed Burn, March 2007, affecting one exceedance and causing higher values in Swain County as follows:
    County Exceedance
    Date
    City Station Name Station Id
    Swain 3/22/2007 Bryson City Bryson 37-173-0002
    Swain 3/28/2007 Bryson City Bryson 37-173-0002
  • Fires in Georgia, Wildfires, May 2007, affecting one exceedance in Robeson County
     
  • Fort Bragg Burn, Prescribed Burn, June 2007, affecting one exceedance in Wake County
     
  • Dobson and Shortoff Fires, Wildfires, June 2007, affecting two exceedances in Mitchell County as follows:
    County Exceedance
    Date
    City Station Name Station Id
    Mitchell 6/11/2007 Spruce Pine Spruce Pine 37-121-0001
    Mitchell 6/14/2007 Spruce Pine Spruce Pine 37-121-0001
  • Local Fires, Wildfires, August 2007, affecting one exceedance in Robeson County
     
  • Idaho/Montana/Canadian Fires, Wildfires, 2006 to 2007, affecting scattered exceedances and causing higher values in State and Local Program Monitoring Stations as follows:
    • State

 

County Exceedance
Date
City Station Name Station Id
Davidson 8/4/2007 Lexington Lexington 37-057-0002
Catawba 8/5/2007 Hickory Hickory 37-035-0004
Wake 8/5/2007 Raleigh Millbrook 37-183-0014
Guilford 8/5/2007 Greensboro Mendenhall 37-081-0013
  • Local Program
County Exceedance
Date
City Station Name Station Id
Mecklenburg 7/1/2006 Charlotte Garinger 37-119-0041
Mecklenburg 7/1/2006 Charlotte Oakdale 37-119-0043
Mecklenburg 8/5/2007 Charlotte Garinger 37-119-0041
Mecklenburg 8/5/2007 Charlotte Oakdale a 37-119-0043
Mecklenburg 8/6/2007 Charlotte Garinger 37-119-0041
Mecklenburg 8/6/2007 Charlotte Oakdale a 37-119-0043
Mecklenburg 8/17/2007 Charlotte Garinger 37-119-0041
Mecklenburg 8/17/2007 Charlotte Oakdale 37-119-0043
Mecklenburg 9/5/2007 Charlotte Garinger 37-119-0041
Mecklenburg 9/5/2007 Charlotte Oakdale 37-119-0043
  • a Oakdale did not exceed the PM2.5 daily standard on 8/5/07 and 8/6/07.